Application Guide | iC2-Micro Frequency Converters
Enter the value from the motor nameplate data. This parameter is available only when P 4.2.1.1 Motor Type is set to [1] PM, Non-salient
PM.
Note: Changing this parameter affects the settings of other parameters.
Default value: Size Related Parameter type: Range (0.1–10000.0)
Parameter
number:
126 Unit: Nm
Data type: uint32 Access type: Read/Write
7.5.2.4 Permanent Magnet Motor (Menu Index 4.2.4)
P 4.2.4.1 Back EMF
Set the nominal back EMF for the motor when running at 1000 RPM. Back EMF is the voltage generated by a PM motor when no
frequency converter is connected, and the shaft is turned externally.
Back EMF is normally specified for nominal motor speed or for 1000 RPM measured between 2 lines.
If the value is not available for a motor speed of 1000 RPM, calculate the correct value as follows. If back EMF is, for example, 320 V at
1800 RPM, it can be calculated as 1000 RPM: Back EMF = (Voltage/RPM)*1000 = (320/1800)*1000 = 178.
This parameter is only active when P 4.2.1.1 Motor Construction is set to options that enable PM (Permanent Magnet) motors.
Default value: Size Related Parameter type: Range (Size Related)
Parameter
number:
140 Unit: V
Data type: uint16 Access type: Read/Write
NOTICE
When using PM motors, it is recommended to use brake resistors.
P 4.2.4.3 d-axis Inductance Ld
Enter the value of the d-axis inductance. Obtain the value from the permanent magnet motor datasheet or perform an AMA on a cold
motor.
Default value: Size Related Parameter type: Range (Size Related)
Parameter
number:
137 Unit: mH
Data type: int32 Access type: Read/Write
P 4.2.4.4 d-axis Inductance LdSat
This parameter corresponds to the inductance saturation of Ld. Ideally, this parameter has the same value as P 4.2.2.3 Nominal Current.
However, if motor supplier provides an inductance curve, the inductance value at 100% of P 4.2.2.3 Nominal Current should be entered
here.
Default value: Size Related Parameter type: Range (Size Related)
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